Gummed strip



April 27 1926.

B. G. BUNDY GUMMED STRIP Filed NOV. 25,. 1925 hmfif y MM w1@- PatentedApr. 27, 1926. y'

- UNITED STATES PATENT OFFICE.

BENJAMIN G. BUNDY, OF 'NASHUIL NEW HAMPSHIRE, ASSIGNOR TO- NASHUA GUMMEDa COATED PAPER COMPANY, or MASSACHUSETTS.

NASHUA, NEW HAMPSHIRE, A CORPORATION OE GUMMED STRIP.

Application led November 26, 1925. Serial No. 70,887.

To all wlwm'zit may concern.' Beit known that I, BENJAMIN G. BUNDY, acitizen of the United States, and resident lof Nashua, in the county"ofHillsborough l and State of New Hampshire, have invented certa-in newand useful Improvements in Gummed Strips, of which the following is aspecification. y

This invention relates to the production of dry gummed sheet material inthe form of strips, of the Character commonly known as stay stripmaterial which is usually commercialized inthe form of Coils from whichsuitable lengths can be severed for, use in strengthening the corners ofcartons or boxes, or other uses. Such materialis well known.

It is customary to so make the material with longitudinal "marks orscores that when' a strip is being applied to use, such'as on Ithecorner of a box, it will bend along a mid-'width lineso that the stripwill extend equal distances from the corner onto both sides of the box.Of course a single score line is preferably employed to best effect thisresult, and said score line sho-uld be at the exactmid-width of thestrip regardless of the widthof thestrip.

One of the objects of the present invention is to produce such stripshaving score lines in them only, without any weakeningof the bod; (paperor cloth) of the strips, either by cutting into the body or forming bentgrooves therein.

5 Another object is to produce such strips in an economical manner, eachwith a score line in the gum accurately at its mid-width,

. whether the strips are narrow or wide. I attain this last mentionedobject by effect- Lo ing the scoring while the sheet material, having adry coatingy of gum, is being cut into a plurality of strips slde byside. And this is preferably done while said material is being Operatedupon by what is known as :5' a slitting and re-winding machine one typeof which is illustrated in Letters Patent No. 1,484,842, dated -February26, 1924.

-With the above mentioned object in view, the present invention consistsin the stay 0 strip substantiallyas hereinafter described and claimed.

Of the accompanying drawings Figure 1 is a plan view Of so much of aslitting machine equipped with my improve- .2 and 3 is claimed in mydivisional applicaments as is Vnecessary to-an understanding thereof.

Figure 2 is a side elevation of the same. Figure 3 is a detail sideIelevation of the particularl features of my invention which, in thepresent instance, comprises an attachment to a slitter of the generaltype illustrated in the patent referred to.

Figure 4 is a plan view of a piece of scored strip, as producedaccording to my invention.

Figure 5 represents a section on line 5- 5 of Figure 4, on a scaleenlarged toproperly illustrate the strip.

The invention illustrated by Figures 1,

tion Serial No. 90,481, liledFebruary 25, 1926, said figures and thedescription of theV machine serving herein to simplify theCharacteri'stics of the article claimed herein.

Similar referencecharacters,designate similar parts or features in allof the views.

A portion of the frame of the machine' is indicated at 12, said framesupporting Cutter shafts` 13, 14, provided with cooperating disk cutters'15.v It is customary in. slitting and' re-winding machines of the typeillustrated in the patent referred to, to vary the number of cutterdisks and the spacing thereof along their shafts, according to thewidths of the strips into which the sheet avv is to be divided.

In the embodiment of my invention illustrated, a roll or smooth-surfacedbar 16 is mounted in the frame of the machine, and the sheet or web a"provided with a coating of dry gum, passes over said roll or bar on itswayv to the cutters 15 which divide the web into strips.

Loosely mounted onA `a tie rod 17 are blocks 18, the positions of saidblocks along thetiefrod being determined by collars 419 secured to thetie rod between the blocks. Extending through each block 18 is a rod 20having at one end, above the roll 16, a clam couple or head 21 in .whicha sharp-pointed scoring implement 22 is clamped and secured at theproperangle to press on, the g-um coating and crush-it without affectingthe layer which carries the gum.- Inl practice I have found phonographneedles to make effective scoring implements. IThe points thereof bearon the web m where the lattertravels over the roll 16.

' ed a rod 24, the said rod 24 extending above the needle-carrying rod20 and having a 'weight 25 adjustably mounted thereon. By

adjustin` the rods and weights, the needles 22 will e caused to bear onthe dry gum coating of the web a: with more or less pressure accordingto the character of the gum coating on the web. A thick or very hardcoating requires that the needles be caused to bear on the coating withheavier pressure than a thin or soft coating. It is important that thepressure shall besuch that the dry gum will be crushed bythe scratchingoperation of the implements 22, without any cutting or groovingoperation on the body layer b (Fig. 5) of the web. The constructionenables this to be done, so that the paper or cloth layer b will not beweakened in any manner by the scoring operation. Practically it leavesthe layer b uniformly flat from side to side, with two stripes of gum cseparated by a scored line a which retains many fractured particles ofdry gum.

To counteract any tendency of the needlecarrying rods 20 to vibrate andresult in imperfect scoring, it is desirable that some springconnections be made so that inertia or momentum of the weights will not'cause vibra-tions. To. this end I provide a s rin-g 26 connectin eachweight rod 24 with 'a collar 19, an I have also found .it.desirab 1e toemploy a light rubber band toact as a spring for the same purpose. Eachrubber band 27 connects a screw 28 of a weight 25 with a hook 29 carriedby a transvere rod 30 mounted in the frame of the machine.

The machine is provided with a scoring Yneedle and its carrying membersfor each strip to bex 4scored and cut. That is, the scoring units equalthe strips in number. Each scoring unlt can be adjusted along the rod 17to a position that will locate its needle exactly in line with themiddle of the space between cutters that are to determine the width ofthe strip scored by that needle. In other words, While the needles 22act on the web before' it is cut, the cutters (when they and the scoringunits are adjusted according to the intended widths of the strips) severthe web along lines equi-distant from the score lines, so that eachscore will be exactly at the mid-width of each cut strip.

With the mechanism illustrated and described, it is possible for amachine to produce, simultaneously, scored strips of different widthsinstead of uniform widths. For instance, some of the disk cutters 15 maybe two inches apart and others on the same shafts may be one inch apart.It is then only necessary to adjust. the, scoring units along the rod 17so that their needles will be in alinement with the mid-width of thespaces between the cutting disks.

Itl is to be understood that by the terms needles, and paper, employedherein, I do not limit myself to an exact definition of either term. Anypointed implement capable of so scratching the gum as to effect thescoring may be used, and the term paper is to be understood as employedfor the sake of brevity in referring to any web material. I*`urthermorc,the term gum is employed as a generic term for any coating that adheresto the paper. And of course the scored strips may be employed forpurposes other than strictly stay strips.

Having now described my invention, I claim A stay strip having a dry gumcoating, said coating having a narrow line at its midwidth characterizedby the presence of fractured particles of gum effected by a scratchingoperation, the body layer of the strip being of uniform tensile strengththroughout its area.

In testimony whereof I have aixed my signature.

BENJAMIN G. BUNDY.

